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I have a commercial ABB vfd drive that operates a 20 hp motor for an air handling unit, when the system runs around 40- 43 hz, I get a high pitched noise from the motor. I replaced the motor 2 years...

The weird thing is the flow switch is made ( I will look at it) but I have three of these boilers in parrellel, each boiler has a grunfos pump pushing water to the secondary loop, only one boiler is...

The entire loop is insulated with fiberglass, I think the problem is in the summer I am not able to build much ice due to high ambient temps, unfortunitly the are trying to cool a two story building...

A trade school only got my foot in the door, try looking for a plumbing/Hvac small business (mom & pop shop). Thats how I started, I had to dig trenches the first 6 months before a spot came open on...